Abstract
The overturning possibility for the vehicle running at very high speed subjected to the base excitation is investigated. One-half of the whole vehicle is analytically modeled. The vehicle consists of the body, the truck and the wheelset. The body and the truck have 3 degrees of freedom (horizontal, vertical and rolling direction) respectively, and the wheelet has 1 degree of freedom (horizontal direction). Considering the stoppers, the springs between the body and the truck, and that between the truck and the wheelset are treated by the nonlinear springs. The creep force between the flange of the wheel and the rail are considered. The vibrational behavior of the vehicle is calculated when the vehicle is subjected to the actual seismic input in horizontal and vertical directions simultaneously. The possibility of rollover of the vehicle is evaluated by "risk rate of rollover". The risk rate of rollover of the running vehicle is investigated both in a straight track and a curve track.
